Fix || for != in QSTileViewImpl

The block to change colors should only be ran if the colors actually
need to change. The condition was wrongly written, but because those
variables are boolean, the only effect it had was that it would be
called more often (sometimes when colors didn't need to change).

Test: atest QSTileViewImpl
Fixes: 271835100
Change-Id: Idd160b31b72cb18b8d90aa48133dc425a414c697